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Relief theory is typically associated with Sigmund Freud and Herbert Spencer, who saw humor as fundamentally a way to release or save energy generated by repression. Relief theories attempt to describe humor along the lines of a tension-release model. Rather than defining humor, they discuss the essential structures and psychological processes that produce laughter. The two most prominent relief theorists are Herbert Spencer and Sigmund Freud. We can consider two versions of the relief theory: (1) the strong version holds that all laughter results from a release of excessive energy; (2) the weak version claims that it is often the case that humorous laughter involves a release of tension or energy. Freud develops a more specific description of the energy transfer mechanism, but the process he describes is not essential to the basic claims of the relief theory of humor.
Relief theories of laughter do not furnish us a way to distinguish humorous from non-humorous laughter. Freud’s saved energy is perceptually indistinguishable with other forms of energy. As we saw with Spencer, Relief theories must be saddled to another theory of humor. Freud’s attempt to explain why we laugh is also an effort to explain why we find certain tendentious jokes especially funny, though it is not clear what he is getting at in his account of the saving of energy. He commits the fundamental mistake of relief theorists — they erroneously assume that since mental energy often finds release in physical movement, any physical movement must be explainable by an excess of nervous energy.